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Search: id:A109505
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| A109505 |
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Consider the smallest pair of consecutive square-free numbers (r,s) with gcd(r,s) = n; sequence gives values of r, or -1 if n is not square-free. |
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| 1, 422, 174, -1, 22830, 9216772051254, 234374, -1, -1
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